If I had to cope with a bullshit jobs that required only physical capabilities, I should try to advance in my start-up or whatever high thinking I am doing. Newton created his gravitation law when the university was shut-down because the pest. Doing something really nasty make you enjoy a lot your mental work in your real passion.
Also, having your mind free but your arms working is a good way of thinking deeply.
Edit1: I should add I don't like bullshit jobs!
Edit2: Addendum For example you should try to learn and read a lot at night but just some core points, and the next day while working physically you should echo mentally all those material, discussing, analysing all in your head.
When I was younger I could reason without writing, now I should need to write thing down, anyway the desire to get out of a bullshit job is a great force, the most boring the job stronger the desire to escape from that job and greater the concentration you find to center into your real passion, your real job, the one you adore.
Also, having your mind free but your arms working is a good way of thinking deeply.
Edit1: I should add I don't like bullshit jobs!
Edit2: Addendum For example you should try to learn and read a lot at night but just some core points, and the next day while working physically you should echo mentally all those material, discussing, analysing all in your head.
When I was younger I could reason without writing, now I should need to write thing down, anyway the desire to get out of a bullshit job is a great force, the most boring the job stronger the desire to escape from that job and greater the concentration you find to center into your real passion, your real job, the one you adore.